111021221221 has 4 divisors (see below), whose sum is σ = 113383374912. Its totient is φ = 108659067532.

The previous prime is 111021221177. The next prime is 111021221243. The reversal of 111021221221 is 122122120111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 111021221221 - 2¹⁹ = 111020696933 is a prime.

It is a super-2 number, since 2×111021221221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111021221195 and 111021221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021221621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1181076775 + ... + 1181076868.

It is an arithmetic number, because the mean of its divisors is an integer number (28345843728).

Almost surely, 2^111021221221 is an apocalyptic number.

It is an amenable number.

111021221221 is a deficient number, since it is larger than the sum of its proper divisors (2362153691).

111021221221 is an equidigital number, since it uses as much as digits as its factorization.

111021221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2362153690.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 111021221221 its reverse (122122120111), we get a palindrome (233143341332).

The spelling of 111021221221 in words is "one hundred eleven billion, twenty-one million, two hundred twenty-one thousand, two hundred twenty-one".